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When I plug in my USB Keyboard (Microsoft Comfort Curve 2000), an "Unknown device" shows up in Device Manager:

Occassionaly the keyboard is showed correctly as "Comfort Curve 2000" but still with this yellow triangle. When I uninstall "unknown device" and plug in keyboard, this shows up:

The keyboard was working perfectly before 15 February. During 15-24 February period I didn't use it at all, and today (25 February) it doesn't work. During this time I installed drivers to pciexpress usb 3.0 and a couple of windows updates. I uninstalled them both, but still no luck.

The keyboard works both in BIOS and other computers, so both USB port and the keyboard are fine. I once managed to use it in Windows after restart (not sure how) but it stopped working after a couple of minutes (perhaps it tried to find "better" drivers?).

I don't care if it'll be recognized as Microsoft Keyboard, generic USB keyboard driver would be just fine, but choosing it from drivers list doesn't help.

I tried to remove all keyboard-related devices from Device manager and rebooting.

I know you have stated the Keyboard works on other Computers .. But i think the problem is more than likely a faulty Keyboard will work some times only .. It would be a good idea to get another Keyboard and try it .. That should determine what the problem is ..

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